Distributed Dynamic Inter-Cell Interference Management for Femtocell Networks Using Over-the-Air Single-Tone Signaling

TL;DR

This paper introduces a novel single-tone signaling method for distributed dynamic interference management in femtocell networks, enhancing performance without system overhead or synchronization issues.

Contribution

It proposes a new over-the-air single-tone signaling scheme with advantageous properties and two distributed interference management schemes based on it.

Findings

Significant performance improvements demonstrated in simulations.

The STS scheme has no system overhead or interference issues.

Enables high-quality wideband channel estimation.

Abstract

Femtocell networks are promising for not only improving the coverage but also increasing the capacity of current cellular networks. The interference-limited reality in femtocell networks makes interference management (IM) the key to maintaining the quality of service and fairness in femtocell networks. Over-the-air signaling is one of the most effective means for fast distributed dynamic IM. However, the design of this type of signal is challenging. In this paper, we address the challenges and propose an effective solution, referred to as single-tone signaling (STS). The proposed STS scheme possesses many highly desirable properties, such as no dedicated resource requirement (no system overhead), no near-far effect, no inter-signal interference, and immunity to synchronization error. In addition, the proposed STS signal provides a means for high quality wideband channel estimation for the use of coordinated techniques, such as coordinated beamforming. Based on the proposed STS, two distributed dynamic IM schemes, ON/OFF power control and SLNR (signal-to-leakage-plus-noise-ratio)-based transmitter beam coordination, are proposed. Simulation results show significant performance improvement as a result of the use of STS-based IM schemes.